He also emphasized the importance of all countries in the region to work together to prevent the financing of terrorist organizations and stop the promotion of extremist ideology, according to a White House statement.
Emirati Minister of State for Foreign Affairs Anwar Gargash also acknowledged Wednesday that leaked emails published by news outlets from its ambassador to the United States were true.
Mr Trump wrote on Twitter. The Arab Sunni nations accuse Qatar of supporting radical groups, including allowing or encouraging financial support. The nations withdrew their ambassadors from Qatar and cut off air, sea and land travel to the peninsular nation, which is rich in oil but depends heavily on imported food.
Among the individuals named is Youssef al-Qaradawi, an Egyptian-born cleric considered a spiritual leader of the Muslim Brotherhood, a Sunni Islamist group.
Saudi Arabia is closing its border with Qatar, leaving citizens of the peninsula nation scrambling for food and supplies. Home to some 10,000 troops, it is central to the US-led fight against the Islamic State group in Iraq and Syria.
Although applauding a Kuwaiti effort to mediate the crisis, Gargash said Emirati and Saudi officials planned to concede nothing to Qatar, an global air travel hub now cut off from some of the skies around it and blocked from receiving the trucks full of food it relies on to feed its citizens.
Sheikh Mohammed bin Abdulrahman Al Thani, the country’s foreign minister, called the moves by Arab neighbours and others “clear violations of global law and worldwide humanitarian law”.
Trump said he helped plan the move against Qatar, although a senior administration official told Reuters earlier this week that the USA had no indication from the Saudis or Emiratis during the visit that they would sever ties with Qatar.